New reset trait

rustsbi/src/lib.rs

@@ -12,6 +12,7 @@ mod hart_mask;
 mod ipi;
 mod logo;
 mod privileged;
+mod reset;
 mod timer;
 
 const SBI_SPEC_MAJOR: usize = 0;
@@ -25,4 +26,5 @@ pub use hart_mask::HartMask;
 pub use ipi::{init_ipi, Ipi};
 pub use logo::LOGO;
 pub use privileged::enter_privileged;
+pub use reset::{init_reset, Reset};
 pub use timer::{init_timer, Timer};

rustsbi/src/reset.rs

@@ -0,0 +1,20 @@
+//! Legacy reset method
+
+/// Legacy reset method
+pub trait Reset: Send {
+    /// Puts all the harts to shut down state from supervisor point of view. This SBI call doesn’t return.
+    fn reset(&self) -> !;
+}
+
+use alloc::boxed::Box;
+use spin::Mutex;
+
+lazy_static::lazy_static! {
+    static ref RESET: Mutex<Option<Box<dyn Reset>>> =
+        Mutex::new(None);
+}
+
+#[doc(hidden)] // use through a macro
+pub fn init_reset<T: Reset + Send + 'static>(reset: T) {
+    *RESET.lock() = Some(Box::new(reset));
+}